Transcript Quiz 2014.09.26

Two balls, one twice as massive as the other, are dropped from
the roof of a building (freefall). Just before hitting the ground,
the more massive ball has ______ the kinetic energy of the less
massive ball. Neglect air resistance.
½
The same
Twice
Four times
0%
es
rt
im
Fo
u
ic
Tw
sa
m
e
Th
0%
e
0%
e
0%
½
A.
B.
C.
D.
A skier is on a
frictionless slope. If
starting from rest, at
which point will the
skier momentarily
rest?
0%
es
e
0%
h
0%
ft
0%
o
0%
ne
0%
N
o
A.
B.
C.
D.
E.
F. None of these
A block of mass m is at rest at the top of a ramp of
vertical height h. The block starts to slide down the
frictionless ramp and reaches a speed v at the bottom.
If the same block were to reach a speed 2 v at the
bottom, it would need to have slid down a frictionless
ramp of vertical height _____.
0%
0%
0%
5h
h
2)
*
sq
rt
(
0%
4h
0%
3h
0%
2h
h
sqrt(2)*h
2h
3h
4h
5h
h
A.
B.
C.
D.
E.
F.
A lighter car and a heavier truck, both initially
at rest, are pushed with the same constant
force F. After both vehicles travel a distance d,
which of the following statements is true?
(Ignore friction)
n.
..
at
io
in
fo
rm
ug
h
ha
ill
ot
e
no
w
ey
Th
0%
e.
..
sa
m
ve
th
e
ve
ha
ill
w
ey
Th
0%
th
e
sa
m
e
h.
..
ill
w
tr
uc
k
r
av
ie
he
e
Th
0%
...
0%
N
A. The heavier truck will
have more kinetic energy
B. They will have the same
velocity
C. They will have the same
kinetic energy
D. Not enough information
to determine
The engine of a 1000 kg sports car rotates the tires, creating a net
forward force on the car due to friction with the ground that varies as a
function of distance. The force is shown in the figure. If the car starts at
rest, How much work does the car do during the first 500 meters?
Rank
1
2
Responses
3
4
5
6
0%
1
0%
2
0%
3
0%
4
0%
5
0%
6
The engine of a 1000 kg sports car rotates the tires, creating a net
forward force on the car due to friction with the ground that varies as
a function of distance. The force is shown in the figure. If the car
starts at rest, what is the speed of the car after traveling 500 meters?
Rank
1
2
Responses
3
4
5
6
0%
1
0%
2
0%
3
0%
4
0%
5
0%
6